The effect of calcium supplementation on bone calcium balance and calcium and bone metabolism during load carriage in women: a randomized controlled crossover trial
Authors' conclusion
A 1000 mg calcium supplement before load carriage promotes bone calcium balance and prevents disruptions to bone and calcium homeostasis.
Study context
- Population
- Women performing two load carriage sessions (12.8 km in 120 min carrying 20 kg)40 completed session 2
- Participants
- 48 women
- Comparison
- 1000 mg calcium vs nothing 60 min before load carriage
Methodological detailsrandomized order
- Randomized order
Primary result
As reported in the abstract
Calcium isotope ratio (δ44/42Ca) and markers of calcium and bone metabolism
- Serum δ44/42Ca did not change with load carriage in Control
- p = .617
- Serum δ44/42Ca increased in Calcium
- p = .003
- Ionized calcium (iCa) decreased from pre-exercise to all exercise time-points
- p < .001
- PTH increased from pre-exercise to 120 min in Control
- p < .001
- PTH decreased from pre-exercise to all time-points in Calcium
- p < .001
- βCTX decreased from pre-exercise to 20 to +15 min in Control
- p ≤ .004
- βCTX decreased from pre-exercise to 0 to +90 min in Calcium
- p < .001
Original publication
The effect of calcium supplementation on bone calcium balance and calcium and bone metabolism during load carriage in women: a randomized controlled crossover trial. J Bone Miner Res. Published 13 January 2025. doi:10.
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